The basic concept is the Workout. A workout has, at a minimum, a date/time and one or more Exercise. Each Exercise has one or more Working Sets that consists of a weight and a number of reps.

Optionally, the Workout can record the following:

• tempo of the workout
• the difficulty, or effort, as a subjective measure
• the duration of rest intervals
• an orthopedic index of any pain
• the rate of perceived exertion (RPE) is as follows (RPE below 6 is considered "warm up", not a work set:
  • @10: Maximal Effort. No reps left in the tank.
  • @9: Heavy Effort. Could have done one more rep.
  • @8: Could have done two or three more reps.
  • @7: Bar speed is "snappy" if maximal force is applied.
  • @6: Bar speed is "snappy" with moderate effort.

https://www.t-nation.com/training/log-your-training-like-a-boss

workout { Date 1..n of exercise { 1..n of set: weight x reps } rest intervals tempo difficulty/effort Volume = sets x weight x reps Intensity = volume / total reps orthopedic index RPE }